Forensic Analysis of Soil Assignment Example | Topics and Well Written Essays - 1500 words

Forensic Analysis of Soil - Assignment Example Soils develop on these accumulated sediments because of physical and chemical weathering. The characteristic of the uniqueness of the soil such as horizon that has unique physical and chemical properties, color, structure, and texture are the common features that and in forensic analysis. Techniques currently used to characterize soil samples rely on either physical descriptors such as color, density gradient, particle size determination, and microscopy or chemical analysis chemical analysis such as elemental composition. However, these characterization techniques are not adequately capable of investigating organic compounds present in the soil. On the other hand, Fourier Transform Infrared Spectroscopy (FTIR) technique involves collecting a range of soil sample that has already undergone oxidative pyrolysis hence all organic have been degraded. This spectrum is spectrum is subtracted from the spectrum of the same sample that contains the organic prior to pyrolysis. The result IR spectrum represents the organic portion of the sample. Samples of soil collected from within the agriculture site where the murder scene is committed to the victim. After soil samples are collected from the surface to 3.4 below, the sample from the scene is compared with various color layers of different places several miles from the ‘agricultural site’ of the scene. Each sample is compared to every color in the Munsell Color Chart and is assigned a Munsell value. A second examiner later confirms each color assignment. The assigned values help to indicate the soil color both before and after pyrolysis is similar within the ‘agricultural site’. Color is a useful tool to distinguish soils that do not share a common color to show that they do not have a common source. Lastly, those soil samples that cannot be distinguished using color are submitted to a more rigorous analysis to eliminate common provenance.

The beginning of the social media Essay Example | Topics and Well Written Essays - 500 words

The beginning of the social media - Essay Example The early social media explorers made gadgets that were called â€Å"boxes† which were homemade devices that were capable of generating tones hence allowing people to make calls as well as get an experimental back end of telephone systems (Peacock, 2011). Social media has various impacts to our lives especially the people who spend most of their times in social networks. Today, social media has enslaved 72% of men and 79% of women (Trusov, Bucklin, & Pauwels 2009). It has become part of our culture and almost everyone has been affected either directly or indirectly. One of the most profound effects of social media is its impact on our interaction with other people in offline situations. Social competency is a very vital ideal, which majorities of the people strive towards; however, it is very evident that social media affects people’s ability competently interacts in an offline setting. Recent studies based on social competency of teenagers and youths who spend most of their time on social media networks are very conflicting. For instance, a research conducted by the national institute of health showed that youths with stronger and positive offline relationships are probably those that frequently use social media networks in a dditional to interacting face-to –face with the peers (Ryan, 2011). Conversely, other studies show that social media is the excellent avenue for most introverted people to interact with others. Most of the people who are not comfortable in face-to-face interactions prefer interacting with other people in the online environment. The growth and popularity of social media is growing at very fast rates due the advancement in technology. The internet plays a very important role in the growth of social media networks. Today, the internet offers us with various social networking sites that enable us to interact with our friends online. Current